BREAKING v3 cutover: flatten events and snapshot testing API

[0xjcf]

Summary

• hard-cut the v3 testing/runtime surfaces to snapshot vocabulary and flat event members
• align runtime event capture, event typing, story summaries, examples, and docs with the cutover
• close the FAS batch for the three dependent v3 breaking tasks

Verification

• .fas/scripts/verify.sh --full
• coderabbit review --agent -t committed --base beta -c AGENTS.md (0 issues before final FAS-only closeout projection)
• push hook package tests: 47 files / 530 tests passed

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fas/v3-breaking-cutover-batch

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[codecov]

Codecov Report

❌ Patch coverage is 87.34940% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.02%. Comparing base (2f86faa) to head (e3050cb).
⚠️ Report is 3 commits behind head on beta.

Files with missing lines	Patch %	Lines
packages/ignite-element/src/runtime/agent.ts	84.55%	19 Missing ⚠️
packages/ignite-element/src/testing.ts	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             beta      #87      +/-   ##
==========================================
- Coverage   91.25%   91.02%   -0.24%     
==========================================
  Files          33       34       +1     
  Lines        1830     1972     +142     
  Branches      498      540      +42     
==========================================
+ Hits         1670     1795     +125     
- Misses        150      167      +17     
  Partials       10       10              

Flag	Coverage Δ
unittests	91.02% <87.34%> (-0.24%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...kages/ignite-element/src/createComponentFactory.ts	91.66% <100.00%> (ø)
...ages/ignite-element/src/createProjectionFactory.ts	97.36% <100.00%> (+1.21%)	⬆️
packages/ignite-element/src/react/igniteReact.tsx	100.00% <100.00%> (ø)
...ckages/ignite-element/src/tools/anthropic/index.ts	100.00% <100.00%> (ø)
packages/ignite-element/src/tools/igniteTools.ts	100.00% <100.00%> (ø)
packages/ignite-element/src/tools/openai/index.ts	98.30% <100.00%> (ø)
packages/ignite-element/src/xstate.ts	100.00% <100.00%> (ø)
packages/ignite-element/src/testing.ts	74.42% <92.59%> (-0.01%)	⬇️
packages/ignite-element/src/runtime/agent.ts	91.01% <84.55%> (-3.93%)	⬇️

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